Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
GALLEN JONATHAN
  2. Issuer Name and Ticker or Trading Symbol
SEATTLE GENETICS INC /WA [SGEN]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
299 PARK AVENUE
3. Date of Earliest Transaction (Month/Day/Year)
12/14/2006
(Street)

NEW YORK, NY 10171
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock, par value $0.001 per share 12/14/2006   S   50,000 D $ 5.7237 5,583,300 I By partnerships, corporations and private investment accounts (1)
Common Stock, par value $0.001 per share 12/15/2006   S   250,000 D $ 5.7 5,333,300 I By partnerships, corporations and private investment accounts (1)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
GALLEN JONATHAN
299 PARK AVENUE
NEW YORK, NY 10171
    X    

Signatures

 /s/ Jonathan Gallen   12/15/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) As of December 15, 2006, Ahab Partners, L.P. ("Partners"), Ahab International, Ltd. ("International"), Queequeg Partners, L.P. ("Queequeg"), Queequeg, Ltd. ("Limited") and various private investment accounts (the "Accounts") held in the aggregate 5,333,300 shares of common stock, par value $0.001 per share (the "Shares"), of Seattle Genetics, Inc. Jonathan Gallen possesses sole power to vote and direct the disposition of 4,200,000 Shares held by Ahab, International, Queequeg and Limited. In addition, Mr. Gallen possesses sole power to direct the disposition of 1,133,300 Shares held by the Accounts. Accordingly, for the purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, Mr. Gallen is deemed to beneficially own 5,333,300 Shares. Jonathan Gallen's interest in the securities reported herein is limited to the extent of his pecuniary interest in Partners, International, Queequeg, Limited and the Accounts, respectively, if any.

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